本文转载至 http://blog.csdn.net/arthurchenjs/article/details/6358489

这是获取网卡的硬件地址的代码，如果无法编译通过，记得把下面的这几个头文件加上把。

 

#include <sys/socket.h> // Per msqr

#include <sys/sysctl.h>

#include <net/if.h>

#include <net/if_dl.h>

 

#pragma mark MAC addy

// Return the local MAC addy

// Courtesy of FreeBSD hackers email list

// Accidentally munged during previous update. Fixed thanks to mlamb.

- (NSString *) macaddress

{

    int                    mib[6];

    size_t                len;

    char                *buf;

    unsigned char        *ptr;

    struct if_msghdr    *ifm;

    struct sockaddr_dl    *sdl;

    

    mib[0] = CTL_NET;

    mib[1] = AF_ROUTE;

    mib[2] = 0;

    mib[3] = AF_LINK;

    mib[4] = NET_RT_IFLIST;

    

    if ((mib[5] = if_nametoindex("en0")) == 0) {

        printf("Error: if_nametoindex error/n");

        return NULL;

    }

    

    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {

        printf("Error: sysctl, take 1/n");

        return NULL;

    }

    

    if ((buf = malloc(len)) == NULL) {

        printf("Could not allocate memory. error!/n");

        return NULL;

    }

    

    if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {

        printf("Error: sysctl, take 2");

        return NULL;

    }

    

    ifm = (struct if_msghdr *)buf;

    sdl = (struct sockaddr_dl *)(ifm + 1);

    ptr = (unsigned char *)LLADDR(sdl);

    // NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];

    NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];

    free(buf);

    return [outstring uppercaseString];

}

 

 

 

这写头文件是用于获取ip等系列功能的

#include <arpa/inet.h>

#include <netdb.h>

#include <net/if.h>

#include <ifaddrs.h>

#import <dlfcn.h>

#import "wwanconnect.h//frome apple 你可能没有哦

#import <SystemConfiguration/SystemConfiguration.h>

 

 

获取ip地址的代码有很多

 

这是外网可见的ip地址，如果你在小区的局域网中，那就是小区的，不是局域网的内网地址。

- (NSString *) whatismyipdotcom

{

    NSError *error;

    NSURL *ipURL = [NSURL URLWithString:@"http://www.whatismyip.com/automation/n09230945.asp"];

    NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:1 error:&error];

    return ip ? ip : [error localizedDescription];

}

 

这是获取本地wifi的ip地址

 

// Matt Brown's get WiFi IP addy solution

// Author gave permission to use in Cookbook under cookbook license

// http://mattbsoftware.blogspot.com/2009/04/how-to-get-ip-address-of-iphone-os-v221.html

- (NSString *) localWiFiIPAddress

{

    BOOL success;

    struct ifaddrs * addrs;

    const struct ifaddrs * cursor;

    

    success = getifaddrs(&addrs) == 0;

    if (success) {

        cursor = addrs;

        while (cursor != NULL) {

            // the second test keeps from picking up the loopback address

            if (cursor->ifa_addr->sa_family == AF_INET && (cursor->ifa_flags & IFF_LOOPBACK) == 0) 

            {

                NSString *name = [NSString stringWithUTF8String:cursor->ifa_name];

                if ([name isEqualToString:@"en0"])  // Wi-Fi adapter

                    return [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)cursor->ifa_addr)->sin_addr)];

            }

            cursor = cursor->ifa_next;

        }

        freeifaddrs(addrs);

    }

    return nil;

}

 

NSString和Address的转换

+ (NSString *) stringFromAddress: (const struct sockaddr *) address

{

    if(address && address->sa_family == AF_INET) {

        const struct sockaddr_in* sin = (struct sockaddr_in*) address;

        return [NSString stringWithFormat:@"%@:%d", [NSString stringWithUTF8String:inet_ntoa(sin->sin_addr)], ntohs(sin->sin_port)];

    }

    

    return nil;

}

+ (BOOL)addressFromString:(NSString *)IPAddress address:(struct sockaddr_in *)address

{

    if (!IPAddress || ![IPAddress length]) {

        return NO;

    }

    

    memset((char *) address, sizeof(struct sockaddr_in), 0);

    address->sin_family = AF_INET;

    address->sin_len = sizeof(struct sockaddr_in);

    

    int conversionResult = inet_aton([IPAddress UTF8String], &address->sin_addr);

    if (conversionResult == 0) {

        NSAssert1(conversionResult != 1, @"Failed to convert the IP address string into a sockaddr_in: %@", IPAddress);

        return NO;

    }

    

    return YES;

}

获取host的名称

- (NSString *) hostname

{

    char baseHostName[256]; // Thanks, Gunnar Larisch

    int success = gethostname(baseHostName, 255);

    if (success != 0) return nil;

    baseHostName[255] = '/0';

    

#if TARGET_IPHONE_SIMULATOR

     return [NSString stringWithFormat:@"%s", baseHostName];

#else

    return [NSString stringWithFormat:@"%s.local", baseHostName];

#endif

}

从host获取地址

- (NSString *) getIPAddressForHost: (NSString *) theHost

{

    struct hostent *host = gethostbyname([theHost UTF8String]);

    if (!host) {herror("resolv"); return NULL; }

    struct in_addr **list = (struct in_addr **)host->h_addr_list;

    NSString *addressString = [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];

    return addressString;

}

这是本地host的IP地址

- (NSString *) localIPAddress

{

    struct hostent *host = gethostbyname([[self hostname] UTF8String]);

    if (!host) {herror("resolv"); return nil;}

    struct in_addr **list = (struct in_addr **)host->h_addr_list;

    return [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];

}